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Samsung 850, (64 layer TLC V-NAND) as the article says, is probably a 750 EVO (16nm planar TLC NAND) replacement. It does not appear to be an 850 EVO replacement.

Lets them shift everything away from planar TLC NAND to TLC V-NAND, which is better performing and cheaper to produce. QLC (4-bits per cell) vs. TLC (3-bits per cell) when it does hit will further reduce the cost of NAND per bit, although it will come at the expense of durability, which is why only companies with established 3D NAND manufacturing processes (such as Samsung) are currently trying to tackle it in products ready for sale to end users.

The Anandtech review has a nice spec sheet and discussion on the 1st page:

This is an old article and it's on planar SLC vs. planar MLC vs. planar TLC (and hence doesn't address why 3D NAND is such a big help), but you should get the idea and be able to mentally scale it up to QLC...

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Samsung 850, (64 layer TLC V-NAND) as the article says, is probably a 750 EVO (16nm planar TLC NAND) replacement. It does not appear to be an 850 EVO replacement.

Lets them shift everything away from planar TLC NAND to TLC V-NAND, which is better performing and cheaper to produce. QLC (4-bits per cell) vs. TLC (3-bits per cell) when it does hit will further reduce the cost of NAND per bit, although it will come at the expense of durability, which is why only companies with established 3D NAND manufacturing processes (such as Samsung) are currently trying to tackle it in products ready for sale to end users.

The Anandtech review has a nice spec sheet and discussion on the 1st page:

This is an old article and it's on planar SLC vs. planar MLC vs. planar TLC (and hence doesn't address why 3D NAND is such a big help), but you should get the idea and be able to mentally scale it up to QLC...

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The links above explain it thoroughly, I recommend you go through 'em. Particularly Anandtech's Samsung 850 120GB review above as well as a more in-depth on 3D V-NAND basis in Anandtech's Samsung 850 PRO review linked above.

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The links above explain it thoroughly, I recommend you go through 'em. Particularly Anandtech's Samsung 850 120GB review above as well as a more in-depth on 3D V-NAND basis in Anandtech's Samsung 850 PRO review linked above.

I tought that the 850 was a cheaper 850EVO to replace the 750.

If this is not the case I think that the 850EVO has no sense anymore. Am I wrong?
Will 850EVO be discontinued in favour of the 850?

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It has been confirmed to be a 750 EVO replacement. Beyond that I don't know.

As far as replacement of the 850 EVO, no one seems to know. So far, Samsung's only released the 850 in a 120GB capacity and I think only in a few overseas markets. Maybe keep an eye on CES news (since CES is running right now) and see if any other Samsung 850 capacities have been released?